[DI] Fix handling of inlined definitions by ContainerBuilder #25130
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Team work with @dunglas, debugging behat tests on Symfony 4:
now that everything is private, inlining happens quite often on Symfony 4.
This made us discover an old bug: inlining makes it possible to share the same definition instance to define a locally shared service (local to one service). This is handled properly in PhpDumper, but ContainerDumper is broken. Here is the fix.